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    <title>Document</title>
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<script>
    function computed(str) {
        var arr = str.split('').reverse()
        arr.splice(4,1)
        arr.splice(9,1)
        arr.splice(8,1,'W')
        arr.splice(13,1,'H')
        arr.splice(0,1,'啊')
       var ss= arr.join('')
        console.log(ss);
    }
    computed('hello world 我爱你!')
</script>